<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>光子倒计时</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>

<div class="container">
  <nav> </nav>
  <main>
    <div class="animation-holder">
      <div id="firework"></div>
      <span id="count-down-number">5</span>
    </div>
  </main>
</div>

<script  src="js/script.js"></script>

</body>
</html>
